Multiplication with Tenths

Using Materials

Students work out 3 x 1.4. It is likely that students will group the 3 wholes. Then they group the 12 tenths into 1 whole + 2 tenths.

So 3 x 1.4 = 4.2

Using Materials, Using Imaging, and Using Number Properties

The teacher can select problems from the set below for any stage. When teachers make up their own examples, after grouping the tenths there needs normally to be at least 10 tenths. So 2 x 4.7 is suitable, but 4 x 3.2 is not.

Problems:

3 x 1.5             2 x 1.7                      5 x 1.2                         4 x 0.4

2 x 2.8             3 x 2.5                      6 x 0.5                         5 x 2.4

5 x 4.2             2 x 6.6                      3 x 4.5                        8 x 0.4

6 x 0.5             2 x 10.8                     3 x 9.5                         5 x 6.4

2 x 6.6             x 4.5                         5 x 10.2                       10 x 0.4